重力波活动性对大气化学成分全球分布的影响研究

Gravity waves (GWs) have an important influence on global atmospheric circulation, energy balance and chemical composition distribution, the research of GWs is one of very important and hot problems in atmospheric physics. Most of the researches have focused on the temperature and wind fields disturbances induced by GWs, however on the disturbance of atmospheric chemical composition are less. And these researches are mainly study the chemical composition disturbances near the mesopause by theoretical and numerical simulation, and lack of observational studies of the chemical composition disturbances of throughout the middle and upper atmosphere. Therefore we will study the influence of gravity wave on the global distribution of atmospheric chemical composition. Firstly, using the long-term TIMED satellite data, we will observe and study the GWs influence on spatial and temporal distribution of middle and upper atmospheric chemical composition. This is one of the main objectives of this project. By comparing the distribution characteristics of all kinds of chemical compositions under the effect of GWs, we will reveal their different response to GWs, and clarify the change laws of middle and upper atmospheric GWs. Another goal of this project is to set up a middle and upper atmospheric GWs experience model based on research results of the variations of atmospheric parameter perturbations. This study will not only deepen the current understanding of the GWs propagation characteristics and physical mechanism, but also significantly improve the middle and upper atmospheric dynamics and chemical coupling model.

重力波对全球的大气环流、能量收支及化学成分分布具有重要影响，相关的研究是大气物理学中非常重要和热门的问题之一。目前大部分研究围绕重力波对温度、风场的影响，然而对于重力波引起大气化学成分扰动的研究则较少，而且仅有的研究主要是通过理论和数值模拟分析中层顶附近的化学成分扰动，缺少贯穿整个中高层大气高度的观测研究。因此，我们将开展重力波活动性对大气化学成分全球分布的影响研究。首先，我们计划利用TIMED卫星的长期资料，观测研究重力波对中高层大气化学成分时空分布的影响，这是本项目的目标之一。通过比较重力波作用下的各种化学成分的分布特征，揭示不同大气成分对重力波响应的差异，阐明中高层重力波的变化规律。本项目的另一个目标是基于大气各种参量扰动变化的研究结果，建立中高层大气重力波经验模型。该项目的实施不仅有助于加深对大气重力波传播特性及物理机制的理解，而且对改善中高层大气动力学和化学耦合模式有重要意义。

重力波是大气中最常见、最重要的波动现象之一，在重力波传播过程会造成大气化学成分的波动。本项目基于TIMED卫星的长期资料，围绕重力波活动性对大气化学成分全球分布的影响研究，在大气化学成分扰动参量提取、化学成分扰动的时空变化、全球重力波经验建模研究、重力波传播耗散机制等方面展开了系列研究。本项目发表标注论文2篇，参加会议交流4次。改进了传统观测提取重力波的方法，得到了更可靠的重力波参量信息；研究了重力波化学成分扰动参量随高度、经度、纬度、季节、年际等的变化特性，对比了不同化学成分扰动的分布差异，建立了重力波全球活动性经验模型，分析了其他观测方式（流星雷达）的重力波结果，研究了典型的平流层增温期间的重力波演变特征，探讨了风场对重力波传播的影响，揭示了重力波从低层大气到低热层的传播、耗散等物理过程。本项目对改善中高层大气模式，在学术和空间天气应用研究方面有重要意义。